Taijuan Emmanuel Walker (born August 13, 1992) is a professional baseballpitcher for the Seattle Mariners of Major League Baseball. Walker was listed as one of the Mariners' top 10 prospects for the 2011 season, ranked 4th according to Baseball America.[1] Prior to the 2012 season, he was ranked the second best prospect in the Mariners organization and the 20th best overall.[2][3]